Round steel pipe or rectangular pipe of the same weight has better bending resistance

40 * 60 * weight per meter, and the weight of the steel pipe 60 *, although it is about the same, but it is still not comparable, you said that if the design amount is reasonable for use in the beam, these two pipe fittings will not exceed its elastic stage, and the normal use stage, the corresponding maximum bending moment formula is:

MXE=FY*WNX, FY is the concentrated force of the roof of the house, and WNX is the net cross-sectional modulus of elasticity on the x-axis.

But if the elastic stage is exceeded, the cross-section shape coefficient f is related to the shape of the cross-section, and has nothing to do with the properties of the material, the external load, the rectangular cross-section, the circular cross-section, and the bending capacity of the circular pipe will be better, in fact, if you can't exceed the elastic stage, they are all the same, your purpose is not to require load-bearing! It's good if it doesn't collapse!! Hey, hope it helps!

It should be that the rectangular steel pipe has strong bending resistance.

40*60*weight per meter.

The steel pipe is 60* heavy. Differ.

Compare. said. Use. House beams.

The design dosage is reasonable.

Both types of fittings are actually both.

Surpass. its elastic phase.

And. Use phase.

Corresponding. Bending Moment Formula.

mxe=fy*wnx,fyroom. Roofing.

Assemble. Force. WNXX axis.

Net cross-sectional modulus of elasticity.

Surpass. Resiliency phase.

Cross-section form factor f

with cross-sections. Shape.

off, with the material.

properties, external loads.

Close. Rectangular sections.

Circular sections. and round tubes. Bending resistance. Some. In fact.

Surpass. Resiliency phase. All. Eye.

All. Load-bearing is required. Collapse. Hey.

Hope it helps.

Calculation method of bending strength of square steel pipe:

The formula for calculating the maximum bending normal stress is: =m ( x*wnx). Where:

m is the maximum bending moment that the steel pipe bears; x - plastic development coefficient of the cross-section; For the steel pipe cross-section, take as, wnx – the net cross-sectional modulus of the steel pipe, also known as the net cross-sectional resistance moment.

If the cross-section is not weakened, it can be found through the section steel ** in the steel structure design manual, and if the cross-section is weakened, it can be calculated according to the formula of material mechanics according to the cross-section size through the calculation formula.

Conceptual analysis. Different from square pipes, hollow, belongs to pipes. Steeling: Ingot or billet or steel is pressure-machined into a variety of shapes, sizes, and properties required. Steel is an indispensable and important material for national construction and the realization of the four modernizations, with a wide range of applications and varieties.

According to the different cross-sectional shapes, steel is generally divided into four categories: profiles, plates, pipes and metal products, in order to facilitate the organization of steel production, ordering and management work, it is divided into heavy rail, light rail, large section steel, medium section steel, small section steel, steel cold-formed section steel, high-quality section steel, wire rod, medium and thick steel plate, thin steel plate, electrical silicon steel sheet, strip steel, seamless steel pipe steel, welded steel pipe, metal products and other varieties.

The formula for calculating the maximum bending normal stress is: =m ( x*wnx).

Steel with a hollow section whose length is much larger than its diameter or circumference. According to the cross-sectional shape, it is divided into round, square, rectangular and special-shaped steel pipes; According to the material, it is divided into carbon structural steel pipes, low-alloy structural steel pipes, alloy steel pipes and composite steel pipes.

According to the use, it is divided into steel pipes for transportation pipelines, engineering structures, thermal equipment, petrochemical industry, machinery manufacturing, geological drilling, and high-pressure equipment. According to the production process, it is divided into seamless steel pipe and welded steel pipe, of which seamless steel pipe is divided into hot rolling and cold rolling (drawing), and welded steel pipe is divided into longitudinal welded steel pipe and spiral seam welded steel pipe.

Steel pipes are not only used to transport fluids and powdery solids, exchange heat energy, and make mechanical parts and containers, it is also an economical steel. The use of steel pipes to manufacture building structure grids, pillars and mechanical supports can reduce weight, save metal by 20 40%, and can realize factory mechanized construction. The use of steel pipes to make highway bridges can not only save steel and simplify construction, but also greatly reduce the area of the protective layer and save investment and maintenance costs.

Welded steel pipe is made of coiled tubular steel plate welded by butt seam or spiral seam, and in terms of manufacturing method, it is divided into welded steel pipe for low-pressure fluid transportation, welded steel pipe with spiral seam, direct coil welded steel pipe, welded pipe, etc. Seamless steel pipes can be used in various industries such as liquid pneumatic pipes and gas pipelines. Welded pipes can be used for water pipelines, gas pipelines, heating pipelines, electrical pipes, etc.

Moment of inertia of channel steel ix=101,iy=

The rectangular tube is related to the wall thickness, and the moment of inertia is ix=31(25) and iy=16(13) when the maximum wall thickness is 4mm (3mm).

Therefore, if the bending resistance of the channel steel is much better when used horizontally (legs down), it is not as good as a rectangular pipe (legs facing sideways) when used vertically

It is recommended to consult the mechanical design manual for satisfaction.

Summary. Hello dear! 1.

The theoretical weight of model 20*20* is the theoretical weight of model 50*30*, the theoretical weight of model 25*25* is the theoretical weight of model 50*30*3, the theoretical weight of model 40*40*2 is the theoretical weight of model 50*32*2.

Specifications and weight of rectangular tube steel.

Hello dear! 1.The theoretical weight of model 20*20* is the theoretical weight of model 50*30*, the theoretical weight of model 25*25* is the theoretical weight of model 50*30*3, the theoretical weight of model 40*40*2 is the theoretical weight of model 50*32*2.

What is the weight of the moment management theory?

Hello dear! Rectangular steel management theory weight calculation method: (side length + side length) 2 wall thickness length (40 + 80) 2

The specification of rectangular pipe steel is 10*10*, and the weight formula is the specification and weight of rectangular tube steel.

As the name suggests, the square tube is a kind of square tube type, many kinds of materials can form a square tube body, it is medium, what is it used for, where is it used, most of the square pipes are mostly steel pipes, after unpacking, leveling, curling, welding to form a round pipe, and then rolled into a square pipe by the round pipe and then cut into the required length.

Generally, there are 50 square pipes per package in the spot with large specifications, mostly in 10*10*, and the square pipes are divided into structural square pipes, decorative square pipes, building square pipes, mechanical square pipes, etc.

Square pipe is a name for square pipe, that is, steel pipe with equal side length. It is made of strip steel that has been rolled by process treatment. Pull out the square tube:

Generally, the strip steel is unpacked, flattened, curled, and welded to form a round pipe, and then rolled from the round pipe into a square pipe and then sheared to the required length.

Uses of square tubes:

There are construction, machinery manufacturing, steel construction and other projects, shipbuilding, solar power generation support, steel structure engineering, power engineering, power plants, agricultural and chemical machinery, glass curtain walls, automobile chassis, airports, boiler construction, highway railings, house construction, pressure vessels, oil storage tanks, bridges, power station equipment, lifting and transportation machinery and other higher load welded structural parts, etc.

Summary. Hello dear, <>

40*20* rectangular tube steel weight; 2.50*25* Rectangular tube steel weight; 3.60*40* Rectangular tube steel weight; 4.

70*50* rectangular tube steel weight; 5.80*40* Rectangular tube steel weight; 6.100*50* Rectangular tube steel weight; 7.

120*60* rectangular tube steel weight; 8.150*75* Rectangular tube steel weight.

Specifications and weight of rectangular tube steel.

The specifications of hot-dip galvanized 30*50*60*120* are calculated in this way.

Kiss, hello so sleepy <>

40*20* rectangular tube steel weight; 2.50*25* The weight of the open pipe steel is; 3.60*40* Rectangular tube steel weight; 4.

70*50* rectangular tube steel weight; 5.80*40* Rectangular tube steel weight; 6.100*50* Rectangular tube steel weight; 7.

120*60* rectangular tube steel weight; 8.150*75* Rectangular tube steel weight.

It should be noted that the weight of rectangular tube steel of different thicknesses and lengths will also be different, and the above are only the weights of some common specifications. If it is necessary to specifically calculate the weight resistance of a specific specification of rectangular pipe steel reed, the relevant calculation formula can be used to calculate. [Kaichang Ruxin].

Summary. 2.For hollow round pipes and hollow square pipes with the same cross-sectional area, the bending, bending and knock strength cannot be determined.

Because neither the outer diameter of the round tube nor the maximum width of the square tube are determined, they can only be determined when these two are equal.

Bending section coefficient of hollow square tube:

w1=(h^4-h^4)/(6*h)

Because the bending cross-section coefficient of the hollow circle:

w= *d 3*[1-((d-d) d) 4] 32 round pipes, square steel pipes, round bars of the same length and the same cross-sectional area, which has greater bending strength.

Hello, I'm typing please wait.

1.For hollow round pipes and solid cylinders of the same diameter, the solid pipes have greater resistance to bending, bending and knocking. Because the bending cross-section coefficient of the hollow circle:

w= *d 3*[1-((d-d) d) 4] 32 where d is the outer diameter of the round tube; d is the inner diameter of the tube; When the high dry is d=0, that is, when it is a solid tube, the bending cross-section coefficient w obtains the maximum value, so the bending resistance, bending resistance and knock resistance of the solid cylinder are greater.

2.For the bending, bending and knock strength of hollow round tube and hollow square tube with the same cross-sectional area, the bending, bending and knock resistance cannot be determined. Because the outer diameter of the round tube and the maximum width of the square tube are not determined, they can only be determined when the two are equal.

The bending cross-section coefficient of the hollow square tube: w1=(h 4-h 4) (6*h) because the bending cross-section coefficient of the hollow round code Lishi: w= *d 3*[1-((d-d) d) 4] 32

Hope mine can help you! Have a great day! <>

Who do you listen to? According to the force analysis, the hollow tube does not have the good bending strength of the solid tube, and the hollow tube has many advantages: light weight, saving material ......Depending on its use, if the hollow tube can withstand its strength, the hollow tube is ......Let the outer diameter be d, and the inner diameter of the hollow is d bending section coefficient w solid:

w1 = 32 d 3 hollow: w2 = 32 (d 3 - d 4 d) obviously w1 is greater than w2

The formula of the bending cross-section coefficient of the steel pipe is: (d4-d4) 32d When d=0, it is a solid round steel. It can be seen that the solid round steel of the same diameter is more resistant to bending.

However, compared with solid steel such as round bar, steel pipes are lighter in weight when their bending and torsional strength are the same. Therefore, it is widely used. That is to say, the selection of a larger diameter steel pipe can obtain the same bending strength as the round bar, and the weight of the material is lighter.